Can I use
?

display: flow-root

- CR

The element generates a block container box, and lays out its contents using flow layout. It always establishes a new block formatting context for its contents. It provides a better solution to the most use cases of the "clearfix" hack.

Chrome

  1. ❌ 4 - 57: Not supported
  2. ✅ 58 - 141: Supported
  3. ✅ 142: Supported
  4. ✅ 143 - 145: Supported

Edge

  1. ❌ 12 - 18: Not supported
  2. ✅ 79 - 141: Supported
  3. ✅ 142: Supported

Safari

  1. ❌ 3.1 - 12.1: Not supported
  2. ✅ 13 - 26.0: Supported
  3. ✅ 26.1: Supported
  4. ✅ 26.2 - TP: Supported

Firefox

  1. ❌ 2 - 52: Not supported
  2. ✅ 53 - 143: Supported
  3. ✅ 144: Supported
  4. ✅ 145 - 147: Supported

Opera

  1. ❌ 9 - 44: Not supported
  2. ✅ 45 - 121: Supported
  3. ✅ 122: Supported

IE

  1. ❌ 5.5 - 10: Not supported
  2. ❌ 11: Not supported

Chrome for Android

  1. ✅ 142: Supported

Safari on iOS

  1. ❌ 3.2 - 12.5: Not supported
  2. ✅ 13 - 18.6: Supported
  3. ✅ 26.0: Supported
  4. ✅ 26.1: Supported

Samsung Internet

  1. ❌ 4 - 6.4: Not supported
  2. ✅ 7.2 - 28: Supported
  3. ✅ 29: Supported

Opera Mini

  1. ❌ all: Not supported

Opera Mobile

  1. ❌ 10 - 12.1: Not supported
  2. ✅ 80: Supported

UC Browser for Android

  1. ✅ 15.5: Supported

Android Browser

  1. ❌ 2.1 - 4.4.4: Not supported
  2. ✅ 142: Supported

Firefox for Android

  1. ✅ 144: Supported

QQ Browser

  1. ✅ 14.9: Supported

Baidu Browser

  1. ✅ 13.52: Supported

KaiOS Browser

  1. ❌ 2.5: Not supported
  2. ✅ 3: Supported
Resources:
Chromium bug report
WebKit bug report
Mozilla bug report
Blog post: "The end of the clearfix hack?"